2.2.4　ZooKeeper集群安装

HBase不仅依赖Hadoop，还依赖ZooKeeper，接下来搭建ZooKeeper集群。

先在hadoop101服务器上安装ZooKeeper，然后将ZooKeeper相关文件分发到hadoop102和hadoop103服务器上。

（1）下载ZooKeeper安装包

步骤01　进入ZooKeeper官网，选择3.5.9版本的ZooKeeper服务，如图2-11所示。

图2-11　下载ZooKeeper的网页

步骤02　选择对应版本的源码发布包按钮，下载ZooKeeper安装包，如图2-12所示。

图2-12　下载ZooKeeper安装包的网页

（2）上传并解压安装包

步骤01　通过xftp等工具上传已经下载好的ZooKeeper安装包，并把安装包上传到/opt/software/目录中。

安装ZooKeeper的相关命令如下：

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    #切换到ZooKeeper安装包目录
cd /opt/software/

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步骤02　解压ZooKeeper安装包，执行如下命令：

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    #解压安装包
tar -zxvf zookeeper-3.5.9.tar.gz -C /opt/module/

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范例如下：

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    [root@hadoop101/]#su clay                          //切换到clay用户
[clay@hadoop101/]$ cd /opt/software/       //切换到安装程序包所在的目录
[clay@hadoop101 software]$ tar -zxvf zookeeper-3.5.9.tar.gz
-C /opt/module/                                    //解压安装包

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（3）创建ZooKeeper配置文件

步骤01　执行如下命令切换到ZooKeeper程序目录。

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    #切换到clay用户
[root@hadoop101/]#su clay
#切换到安装程序包所在的目录
[clay@hadoop101/]$ cd /opt/module/zookeeper-3.5.9

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步骤02　创建配置文件，执行如下命令：

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    [clay@hadoop101 software]$ vi  zoo.cfg

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zoo.cfg文件的内容如下：

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    #The number of milliseconds of each tick
tickTime=2000
#The number of ticks that the initial
#synchronization phase can take
initLimit=10
#The number of ticks that can pass between
#sending a request and getting an acknowledgement
syncLimit=5
#the directory where the snapshot is stored.
#do not use /tmp for storage, /tmp here is just
#example sakes.
dataDir=/home/chenjie/zookeeper-3.5.9/tmp
#the port at which the clients will connect
clientPort=2181
#the maximum number of client connections.
#increase this if you need to handle more clients
#maxClientCnxns=60
#
#Be sure to read the maintenance section of the
#administrator guide before turning on autopurge.
#
#http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
#The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
#Purge task interval in hours
#Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
server.1=hadoop101:2888:3888
server.2=hadoop102:2888:3888
server.3=hadoop103:2888:3888

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（4）分发ZooKeeper相关文件并启动

步骤01　在hadoop101服务器上执行如下命令，为其他服务器分发ZooKeeper相关文件。

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    xsync /opt/module/zookeeper-3.5.9/etc/hadoop/

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步骤02　执行上述命令分发文件之后，在各个服务器上执行如下命令启动ZooKeeper服务：

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    #切换到ZooKeeper程序所在的目录
cd /opt/module/zookeeper-3.5.9/bin
#启动ZooKeeper服务
./zkServer.sh

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